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Drivers: hv: Handle vmbus interrupts concurrently on all cpus 

Vmbus interrupts are unique in that while the interrupt is delivered on a
given vector, these can be handled concurrently on different CPUs. Handle the
vmbus interrupts concurrently on all the CPUs.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan 2012-12-01 06:46:54 -08:00 committed by Greg Kroah-Hartman
parent db11f12a11
commit b0209501dc
2 changed files with 22 additions and 1 deletions
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2
drivers/hv/hv.c
View File

@ -335,7 +335,7 @@ void hv_synic_init(void *irqarg)
shared_sint.as_uint64 = 0;
shared_sint.vector = irq_vector; /* HV_SHARED_SINT_IDT_VECTOR + 0x20; */
shared_sint.masked = false;
shared_sint.auto_eoi = false;
shared_sint.auto_eoi = true;
wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);

21
drivers/hv/vmbus_drv.c
View File

@ -33,6 +33,7 @@
#include <acpi/acpi_bus.h>
#include <linux/completion.h>
#include <linux/hyperv.h>
#include <linux/kernel_stat.h>
#include <asm/hyperv.h>
#include <asm/hypervisor.h>
#include "hyperv_vmbus.h"
@ -500,6 +501,19 @@ static irqreturn_t vmbus_isr(int irq, void *dev_id)
return IRQ_NONE;
}
/*
* vmbus interrupt flow handler:
* vmbus interrupts can concurrently occur on multiple CPUs and
* can be handled concurrently.
*/
void vmbus_flow_handler(unsigned int irq, struct irq_desc *desc)
{
kstat_incr_irqs_this_cpu(irq, desc);
desc->action->handler(irq, desc->action->dev_id);
}
/*
* vmbus_bus_init -Main vmbus driver initialization routine.
*
@ -535,6 +549,13 @@ static int vmbus_bus_init(int irq)
goto err_unregister;
}
/*
* Vmbus interrupts can be handled concurrently on
* different CPUs. Establish an appropriate interrupt flow
* handler that can support this model.
*/
irq_set_handler(irq, vmbus_flow_handler);
vector = IRQ0_VECTOR + irq;
/*